EP3850248A1 - Oil cooling circuit of an automatic transmission - Google Patents

Oil cooling circuit of an automatic transmission

Info

Publication number
EP3850248A1
EP3850248A1 EP19769397.1A EP19769397A EP3850248A1 EP 3850248 A1 EP3850248 A1 EP 3850248A1 EP 19769397 A EP19769397 A EP 19769397A EP 3850248 A1 EP3850248 A1 EP 3850248A1
Authority
EP
European Patent Office
Prior art keywords
oil
heat exchanger
automatic transmission
cooling circuit
volume flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19769397.1A
Other languages
German (de)
French (fr)
Inventor
Rainer Fähnle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3850248A1 publication Critical patent/EP3850248A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
    • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T5/00—Vehicle modifications to facilitate cooling of brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
    • F16D57/04—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders with blades causing a directed flow, e.g. Föttinger type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
    • F16H57/0417—Heat exchangers adapted or integrated in the gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D2065/782—Features relating to cooling the brake-actuating fluid being used as a coolant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing

Definitions

  • the present invention relates to the oil cooling circuit of an automatic transmission or automated manual transmission in a drive train.
  • Oil supplies for automatic transmissions or automated manual transmissions conventionally have an oil pump which is driven by the internal combustion engine.
  • the oil pump conveys oil from the oil sump and from there into an oil supply line network for supplying oil to elements of the transmission.
  • the various elements that are present in an automatic transmission or automated manual transmission include clutches, brakes, a converter, a hydrodynamic brake (retarder) and the lubrication points of a transmission.
  • the different elements require a very different oil volume with very different oil pressures at different times during vehicle operation.
  • An oil supply system is known from DE 10 2015 218 358 A1, in which a temperature sensor in the flow direction behind the pump device is provided for oil temperature monitoring, in order to detect the oil temperature in the pressure line. This positioning of the temperature sensor enables critical temperatures in the pressure line to be detected. To further improve operational safety, the temperature sensor can be provided behind the hydrodynamic converter as seen in the flow direction. It is also known to additionally measure the oil sump temperature. Monitoring the oil temperature in the gearbox therefore requires 2 temperature sensors.
  • the present invention is based on the object of specifying an oil supply for an automatic transmission or automated manual transmission that enables optimized cooling of the oil volume flows in different operating states.
  • An oil supply for an automatic transmission or an automated manual transmission in a drive train which comprises an oil sump and a heat exchanger, the oil supply being provided for at least the following operating states of the automatic transmission:
  • two heat exchangers are provided, through which an oil volume flow can be conducted depending on the operating state of the automatic transmission. If two heat exchangers are used, they can each be adapted to the conditions of the operating states, so that the cooling of the corresponding oil volume flows is improved.
  • a measuring device for measuring an oil circuit temperature can be provided, by means of which the temperature of the oil volume flow can be measured in all operating states. This means that the most critical temperature can be monitored for each operating state and the function of the gearbox can be ensured without running the risk of overheating the oil.
  • regulation strategies can be provided in order to keep the temperature of the oil volume flow at a desired level or to regulate it for an operating state.
  • the temperature of the oil volume flow through the converter, in retarder operation, the temperature the oil volume flow through the retarder and in the ferry mode, in which one of the mechanical gears is in operation, the oil sump temperature is measured.
  • both heat exchangers are provided for converter operation and ferry operation and only the second heat exchanger for retarder operation.
  • the measuring device can comprise a sensor, by means of which the temperature of the oil volume flow that flows into the second heat exchanger can be measured.
  • a sensor by means of which the temperature of the oil volume flow that flows into the second heat exchanger can be measured.
  • a certain heat transfer to the flow connection of the second heat exchanger takes place when the oil flow in the first heat exchanger rises sharply, so that through the Heat transfer can also be detected if the temperature rises.
  • thermosensor By positioning the temperature sensor in front of the heat exchanger inlet of the second heat exchanger, different temperatures can be measured depending on the operating state of the transmission, because in all operating states an oil volume flow is passed through the second heat exchanger. A second temperature sensor can thus be dispensed with.
  • the heat exchangers can be designed for different oil volume flows.
  • the channels through the heat exchanger can be designed differently.
  • the oil volume flows through the first heat exchanger and the second heat exchanger can thus preferably be designed in a ratio of 1: 2.
  • Other ratios are also conceivable, which are in the range from 1: 1, 25 to 1: 3.
  • Valves can also be provided in the oil cooling circuit, by means of which the oil volume flows can be regulated.
  • these can be the valves for regulating the converter and the retarder.
  • a pressure control valve for regulating the oil volume flow through the converter can be provided, the pressure control valve being provided between the converter and the first and second heat exchangers.
  • a first changeover valve and a second changeover valve can be provided, so that in the braking operation of the retarder the oil volume flow can be conducted through the second heat exchanger for dissipating the brake energy.
  • the first switching valve can be switchable in such a way that in the ferry mode, in one of the mechanical gears of the automatic transmission, the oil volume flow from the oil sump can be conducted through the second heat exchanger and / or the first heat exchanger via a bypass line.
  • Fig. 1 Functional diagram of the oil circuit for oil supply
  • FIG. 1 shows the functional diagram of the oil circuit according to the invention for supplying oil to an automatic transmission. The scheme was reduced to the details relevant to the invention that are necessary for oil cooling.
  • a pump conveys the oil from the oil sump 19 via the oil supply line 3 to all relevant components in the transmission, so that the oil supply is ensured for at least the following operating states of the automatic transmission; the converter operation;
  • control valve 5 The task of the control valve 5 is to control the power control of the converter 4, which will not be discussed in more detail here.
  • the heated oil that is to say an oil flow, is passed via line 6 and the WT supply line 7 to the heat exchangers 11 and 12.
  • the oil volume flow 21 d is passed from the oil sump 19 via the bypass line 4, the line 6 and the WT supply line 7 to the heat exchangers 11 and 12.
  • the oil volume flow 21 d is routed through the converter 2 through the second heat exchanger 12 and the first heat exchanger 11.
  • the oil volume flow 21 d is divided into the oil volume flows 21 a and 21 b.
  • the two changeover valves 13 and 14 are switched simultaneously, so that only the second heat exchanger 12 is used in the retarder mode for cooling the oil in order to dissipate the braking energy.
  • the retarder control will not be discussed further in connection with this invention.
  • the primary switching valve 14 is switched in a first step, so that the retarder is filled, and at the latest when the filling is complete, the changeover valve 13 is also switched so that the entire oil volume flow 21c is pumped through the retarder 9 and passed through the heat exchanger 12 via the connecting channel 25b.
  • the measuring device 20 whose position in the area of the connecting channel 25 b is shown in more detail in FIG. 2. This is provided for measuring the temperature of the oil volume flow 21 b.
  • One sensor of the measuring device 20 is arranged on the connecting channel 25 b. The temperature of the oil volume flow 21 b in the second heat exchanger 12 can thus be measured for all operating states.
  • control strategies apply, with which the oil temperature is regulated to definable limit temperatures. For example, reducing the braking power of the retarder.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Details Of Gearings (AREA)
  • Control Of Transmission Device (AREA)

Abstract

An oil supply for an automatic transmission or an automated manual transmission in a drive train is proposed, which oil supply comprises an oil sump and a heat exchanger, wherein the oil supply is provided for at least the following operating states of the automatic transmission: • the torque converter mode; • the drive mode in one of the mechanical gears; • the retarder mode. In order to optimize the cooling of the oil volumetric flows in the case of different operating states, it is proposed according to the invention that two heat exchangers (11, 12) are provided, through which an oil volumetric flow can be conducted depending on the operating state of the automatic transmission.

Description

Ölkühlkreislauf eines Automatikgetriebes  Oil cooling circuit of an automatic transmission
Die vorliegende Erfindung betrifft den Ölkühlkreislauf eines Automatikgetriebes oder automatisierten Schaltgetriebes in einem Antriebsstrang. The present invention relates to the oil cooling circuit of an automatic transmission or automated manual transmission in a drive train.
Ölversorgungen von Automatikgetrieben oder automatisierten Schaltgetrieben weisen herkömmlich eine Ölpumpe auf, die durch den Verbrennungsmotor angetrieben wird Die Ölpumpe fördert Öl aus dem Ölsumpf und von diesem in ein Ölversorgungslei- tungsnetz zur Ölversorgung von Elementen des Getriebes. Oil supplies for automatic transmissions or automated manual transmissions conventionally have an oil pump which is driven by the internal combustion engine. The oil pump conveys oil from the oil sump and from there into an oil supply line network for supplying oil to elements of the transmission.
Zu den unterschiedlichen Elementen, die in einem Automatgetriebe oder automati- sierten Schaltgetrieben vorhanden sind, zählen Kupplungen, Bremsen, ein Wandler, eine hydrodynamische Bremse (Retarder) sowie die Schmierstellen eines Getriebes. The various elements that are present in an automatic transmission or automated manual transmission include clutches, brakes, a converter, a hydrodynamic brake (retarder) and the lubrication points of a transmission.
Die unterschiedlichen Elemente benötigen während des Fahrzeugbetriebs zu unter- schiedlichen Zeitpunkten ein sehr unterschiedliches Ölvolumen mit sehr unterschied- lichen Öldrücken. The different elements require a very different oil volume with very different oil pressures at different times during vehicle operation.
Für den sicheren und störungsfreien Betrieb eines Automatgetriebes oder automati- sierten Schaltgetriebes ist es unter anderem wichtig, dass die Öltemperatur in be- stimmten Grenzen bleibt. Aus der DE 10 2015 218 358 A1 ist ein Ölversorungssystem bekannt, bei dem zur Öltemperaturüberwachung ein Temperatursensor in Strömungsrichtung hinter der Pumpvorrichtung vorgesehen ist, um die Öltemperatur in der Druckleitung zu erfas- sen. Durch diese Positionierung des Temperatursensors können insbesondere kriti sche Temperaturen in der Druckleitung erfasst werden. Zur weiteren Verbesserung der Betriebssicherheit kann der Temperatursensor in Strömungsrichtung gesehen hinter dem hydrodynamischen Wandler vorgesehen werden. Weiterhin ist bekannt zusätzlich die Ölsumpftemperatur zu messen. Die Überwa- chung der Öltemperatur im Getriebe erfordert also 2 Temperatursensoren. Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Ölversorgung für ein Automatgetriebe oder automatisierten Schaltgetriebe anzugeben, dass eine optimier- te Kühlung der Ölvolumenströme bei unterschiedlichen Betriebszuständen ermöglicht. For the safe and trouble-free operation of an automatic transmission or automated manual transmission, it is important, among other things, that the oil temperature remains within certain limits. An oil supply system is known from DE 10 2015 218 358 A1, in which a temperature sensor in the flow direction behind the pump device is provided for oil temperature monitoring, in order to detect the oil temperature in the pressure line. This positioning of the temperature sensor enables critical temperatures in the pressure line to be detected. To further improve operational safety, the temperature sensor can be provided behind the hydrodynamic converter as seen in the flow direction. It is also known to additionally measure the oil sump temperature. Monitoring the oil temperature in the gearbox therefore requires 2 temperature sensors. The present invention is based on the object of specifying an oil supply for an automatic transmission or automated manual transmission that enables optimized cooling of the oil volume flows in different operating states.
Es wird eine Ölversorgung für ein Automatikgetriebe oder ein automatisiertes Schalt- getriebe in einem Antriebsstrang vorgeschlagen, die einen Ölsumpf und einen Wär- metauscher umfasst, wobei die Ölversorgung für zumindest folgende Betriebszustän- de des Automatikgetriebes vorgesehen ist: An oil supply for an automatic transmission or an automated manual transmission in a drive train is proposed, which comprises an oil sump and a heat exchanger, the oil supply being provided for at least the following operating states of the automatic transmission:
dem Wandlerbetrieb;  the converter operation;
dem Fährbetrieb in einem der mechanischen Gänge;  the ferry operation in one of the mechanical gears;
dem Retarderbetrieb.  the retarder operation.
Zur Optimierung der Kühlung der Ölvolumenströme bei unterschiedlichen Betriebszu- ständen wird erfindungsgemäß vorgeschlagen, dass zwei Wärmetauscher vorgese- hen sind, durch die je nach Betriebszustand des Automatikgetriebes ein Ölvolumen- strom leitbar ist. Bei der Verwendung von zwei Wärmetauschern können diese jeweils an die Bedingungen der Betriebszustände angepasst werden, so dass die Kühlung der entsprechenden Ölvolumenströme verbessert wird.  In order to optimize the cooling of the oil volume flows in different operating states, it is proposed according to the invention that two heat exchangers are provided, through which an oil volume flow can be conducted depending on the operating state of the automatic transmission. If two heat exchangers are used, they can each be adapted to the conditions of the operating states, so that the cooling of the corresponding oil volume flows is improved.
In einer bevorzugten Ausführung kann eine Messvorrichtung zur Messung einer Öl- kreislauftemperatur vorgesehen sein, mittels der in allen Betriebszuständen die Term- peratur des Ölvolumenstroms messbar ist. Somit kann je Betriebszustand immer die kritischste Temperatur überwacht werden und die Funktion des Getriebes sicherge- stellt werden, ohne dabei Gefahr zu laufen, das Öl zu überhitzen. In a preferred embodiment, a measuring device for measuring an oil circuit temperature can be provided, by means of which the temperature of the oil volume flow can be measured in all operating states. This means that the most critical temperature can be monitored for each operating state and the function of the gearbox can be ensured without running the risk of overheating the oil.
Im Falle einer potentiellen Ölüberhitzung können Abregelstrategien vorgesehen sein, um die Temperatur des Ölvolumenstroms für einen Betriebszustand auf einem ge- wünschten Niveau zu halten bzw. dieses zu regeln. So kann im Wandlerbetrieb die Temperatur des Ölvolumenstroms durch den Wandler, im Retarderbetrieb die Termpe- ratur des Ölvolumenstroms durch den Retarder und im Fährbetrieb, bei dem einer der mechanischen Gänge in Betrieb ist, die Ölsumpftemperatur gemessen werden. In the event of a potential oil overheating, regulation strategies can be provided in order to keep the temperature of the oil volume flow at a desired level or to regulate it for an operating state. In converter operation, the temperature of the oil volume flow through the converter, in retarder operation, the temperature the oil volume flow through the retarder and in the ferry mode, in which one of the mechanical gears is in operation, the oil sump temperature is measured.
In einer bevorzugten Ausführung ist für den Wandlerbetrieb und den Fährbetrieb vor- gesehen beide Wärmetauscher und für den Retarderbetrieb nur den zweiten Wärrme- tauscher zu nutzen. In a preferred embodiment, both heat exchangers are provided for converter operation and ferry operation and only the second heat exchanger for retarder operation.
Weiterhin kann die Messvorrichtung einen Sensor umfassen, mittels dem die Termpe- ratur des Ölvolumenstroms, der in den zweiten Wärmetauscher strömt, messbar ist. Insbesondere bei der Verwendung eines 2-flutigen Wärmetauschers, bei dem die Vorlaufanschlüsse in die zwei Wärmetauscherkanäle für die Ölvolumenströme dicht beieinander liegen, erfolgt bei einem starken Temperaturanstieg des Ölstroms in den ersten Wärmetauscher eine gewisser Wärmeübertragung auf den Vorlaufanschluss des zweiten Wärmetauschers, so dass durch die Wärmeübertragung auch eine sol- eher Temperaturanstieg erfassbar ist. Furthermore, the measuring device can comprise a sensor, by means of which the temperature of the oil volume flow that flows into the second heat exchanger can be measured. In particular, when using a 2-pipe heat exchanger, in which the flow connections in the two heat exchanger channels for the oil volume flows are close together, a certain heat transfer to the flow connection of the second heat exchanger takes place when the oil flow in the first heat exchanger rises sharply, so that through the Heat transfer can also be detected if the temperature rises.
Durch eine Position des Temperatursensors vor dem Wärmetauschereinlass des zweiten Wärmetauschers, können je nach Betriebszustand des Getriebes unter- schiedliche Temperaturen gemessen werden, weil in allen Betriebszuständen ein Öl- volumenstrom durch den zweiten Wärmetauscher geleitet wird. Somit kann auf einen zweiten Temperatursensor verzichtet werden. By positioning the temperature sensor in front of the heat exchanger inlet of the second heat exchanger, different temperatures can be measured depending on the operating state of the transmission, because in all operating states an oil volume flow is passed through the second heat exchanger. A second temperature sensor can thus be dispensed with.
In einer weiteren Ausführungsvariante können die Wärmetauscher für unterschiedli- che Ölvolumenströme ausgelegt sein. Bei einem 2-flutigen Wärmetauscher können beispielsweise die Kanäle durch den Wärmetauscher unterschiedlich ausgelegt sein. In a further embodiment variant, the heat exchangers can be designed for different oil volume flows. In the case of a double-flow heat exchanger, for example, the channels through the heat exchanger can be designed differently.
So können die Ölvolumenströme durch den ersten Wärmetauscher und den zweiten Wärmetauscher bevorzugt in einem Verhältnis von 1 :2 ausgelegt sein. Wobei auch andere Verhältnisse denkbar sind, die im Bereich von 1 : 1 ,25 bis 1 :3 liegen. The oil volume flows through the first heat exchanger and the second heat exchanger can thus preferably be designed in a ratio of 1: 2. Other ratios are also conceivable, which are in the range from 1: 1, 25 to 1: 3.
Im Ölkühlkreislauf können weiterhin Ventile vorgesehen sein, mittels denen die Ölvo- lumenströme regelbar sind. Dies können insbesondere die Ventile zur Regelung des Wandlers und des Retarders sein. So kann ein Druckregelventil zur Regelung des Ölvolumenstroms durch den Wandler vorgesehen sein, wobei das Druckregelventil zwischen Wandler und dem ersten und zweiten Wärmetauscher vorgesehen ist. Weiterhin können ein erstes Umschaltventil und ein zweites Umschaltventil vorgese- hen sein, so dass im Bremsbetrieb des Retarders der Ölvolumenstrom zur Brerm- senergieabfuhr durch den zweiten Wärmetauscher leitbar ist. Valves can also be provided in the oil cooling circuit, by means of which the oil volume flows can be regulated. In particular, these can be the valves for regulating the converter and the retarder. For example, a pressure control valve for regulating the oil volume flow through the converter can be provided, the pressure control valve being provided between the converter and the first and second heat exchangers. Furthermore, a first changeover valve and a second changeover valve can be provided, so that in the braking operation of the retarder the oil volume flow can be conducted through the second heat exchanger for dissipating the brake energy.
Das erste Schaltventil kann derart schaltbar sein, dass im Fährbetrieb, in einem der mechanischen Gänge des Automatikgetriebes, der Ölvolumenstrom aus dem Öl- sumpf über eine Bypassleitung durch den zweiten Wärmetauscher und/oder den ers- ten Wärmetauscher leitbar ist. The first switching valve can be switchable in such a way that in the ferry mode, in one of the mechanical gears of the automatic transmission, the oil volume flow from the oil sump can be conducted through the second heat exchanger and / or the first heat exchanger via a bypass line.
Anhand von Ausführungsbeispielen werden weitere vorteilhafte Ausprägungen der Erfindung unter Bezugnahme auf die Zeichnungen erläutert. Die genannten Merkmale können nicht nur in der dargestellten Kombination vorteilhaft umgesetzt werden, son- dern auch einzeln untereinander kombiniert werden. Die Figuren zeigen im Einzelnen: On the basis of exemplary embodiments, further advantageous features of the invention are explained with reference to the drawings. The features mentioned can not only be implemented advantageously in the combination shown, but can also be combined individually with one another. The figures show in detail:
Fig.1 Funktionsschema des Ölkreislaufes zur Ölversorgung Fig. 1 Functional diagram of the oil circuit for oil supply
Fig.2 Ansicht auf die Wärmetauscherkonsole  Fig.2 View of the heat exchanger console
In Figur 1 ist das Funktionsschema des erfindungsgemäßen Ölkreislaufes zur Ölver- sorgung eines Automatikgetriebes dargestellt. Dabei wurde das Schema auf die er- findungsrelevanten Details, die für die Ölkühlung notwendig sind, reduziert. FIG. 1 shows the functional diagram of the oil circuit according to the invention for supplying oil to an automatic transmission. The scheme was reduced to the details relevant to the invention that are necessary for oil cooling.
Eine nicht dargestellte Pumpe fördert das Öl aus dem Ölsumpf 19 über die Ölzuführ- leitung 3 zu allen relevanten Bauteilten im Getriebe, so dass die Ölversorgung für zumindest folgende Betriebszustände des Automatikgetriebes sichergestellt sind; dem Wandlerbetrieb; A pump, not shown, conveys the oil from the oil sump 19 via the oil supply line 3 to all relevant components in the transmission, so that the oil supply is ensured for at least the following operating states of the automatic transmission; the converter operation;
dem Fährbetrieb in einem der mechanischen Gänge;  the ferry operation in one of the mechanical gears;
dem Retarderbetrieb. Diese drei Betriebszustände bewirken einen Energieeintrag in das Öl der zu einer Temperaturerhöhung des Öls führt. Beim Anfahren des Kraftfahrzeugs wird das Ge- triebe mittels des Ventils 26 in den Wanderbetrieb geschaltet. Für den Wanderbetrieb wird das Regelventil 5 derart geregelt, dass zumindest ein Teilvolumenstrom des von der Pumpe geförderten Ölvolumenstrom 21 d durch den Wandler 2 geleitet wird. the retarder operation. These three operating states result in an energy input into the oil which leads to an increase in the temperature of the oil. When the motor vehicle is started up, the transmission is switched to walking operation by means of valve 26. For the traveling operation, the control valve 5 is controlled in such a way that at least a partial volume flow of the oil volume flow 21d conveyed by the pump is passed through the converter 2.
Aufgabe des Regelventils 5 ist es, die Leistungsregelung des Wandlers 4 zu regeln, auf die hier nicht näher eingegangen wird. Das erhitzte Öl, also ein Ölvolmenstrom wird über die Leitung 6 und die WT-Zuführleitung 7 zu den Wärmetauschern 11 und 12 geleitet. The task of the control valve 5 is to control the power control of the converter 4, which will not be discussed in more detail here. The heated oil, that is to say an oil flow, is passed via line 6 and the WT supply line 7 to the heat exchangers 11 and 12.
Im Fährbetrieb, in einem der mechanischen Gänge des Automatikgetriebes, wird der Ölvolumenstrom 21 d aus dem Ölsumpf 19 über die Bypassleitung 4, die Leitung 6 und die WT-Zuführleitung 7 zu den Wärmetauschern 11 und 12 geleitet. In ferry operation, in one of the mechanical gears of the automatic transmission, the oil volume flow 21 d is passed from the oil sump 19 via the bypass line 4, the line 6 and the WT supply line 7 to the heat exchangers 11 and 12.
Hier sind nun unterschiedliche Schaltungen möglich. In der dargestellten Schaltstel- lung des ersten Schaltventils 13 wird der Ölvolumenstrom 21 d vom Wandler 2 korm- mend durch den zweiten Wärmetauscher 12 und den ersten Wärmetauscher 11 ge- leitet. Der Ölvolumenstrom 21 d teilt sich in die Ölvolumenströme 21 a und 21 b auf. Different circuits are now possible here. In the switching position of the first switching valve 13 shown, the oil volume flow 21 d is routed through the converter 2 through the second heat exchanger 12 and the first heat exchanger 11. The oil volume flow 21 d is divided into the oil volume flows 21 a and 21 b.
Denkbar ist aber auch, dass nur das erste Schaltventil 13 in die zweite Schaltstellung geschaltet wird, so dass der Ölvolumenstrom 21 d vom Wandler 2 oder Bypass 4 kommend über den Verbindungskanal 25 a nur durch den ersten Wärmetauscher 11 geleitet wird. Der Ölvolumenstrom 21 d entspricht dem Ölvolumenstrom 21 a. However, it is also conceivable that only the first switching valve 13 is switched to the second switching position, so that the oil volume flow 21 d coming from the converter 2 or bypass 4 is only passed through the connecting channel 25 a through the first heat exchanger 11. The oil volume flow 21 d corresponds to the oil volume flow 21 a.
Im Retarderbetrieb werden dagegen die beiden Umschalt-Ventile 13 und 14 gleichzei- tig geschaltet, so dass nur der zweite Wärmetauscher 12 im Retarderbetrieb zur Küh- lung des Öls genutzt wird, um die Bremsenergie abzuführen. Auf die Retarderrege- lung wird im Zusammenhang mit dieser Erfindung nicht weiter eingegangen. In contrast, in the retarder mode, the two changeover valves 13 and 14 are switched simultaneously, so that only the second heat exchanger 12 is used in the retarder mode for cooling the oil in order to dissipate the braking energy. The retarder control will not be discussed further in connection with this invention.
Alternativ könnte aber auch vorgesehen sein, dass In einem ersten Schritt das Urm- schalt-Ventil 14 geschaltet wird, so dass der Retarder befüllt wird, und spätestens wenn die Befüllung abgeschlossen ist, auch das Umschaltventil 13 geschaltet wird, so dass der gesamte Ölvolumenstrom 21c durch den Retarder 9 gepumpt und über den Verbindungskanal 25b durch den Wärmetauscher 12 geleitet wird. Entscheidend für die Erfindung ist weiterhin die Messvorrichtung 20 deren Position im Bereich des Verbindungskanals 25 b in Figur 2 näher dargestellt ist. Diese ist zur Messung der Temperatur des Ölvolumenstroms 21 b vorgesehen. Der eine Sensor der Messvorrichtung 20 ist am Verbindungskanal 25 b angeordnet. Die Temperatur des Ölvolumenstroms 21 b in den zweiten Wärmetauscher 12 kann so für alle Be- triebszustände gemessen werden. Alternatively, however, it could also be provided that the primary switching valve 14 is switched in a first step, so that the retarder is filled, and at the latest when the filling is complete, the changeover valve 13 is also switched so that the entire oil volume flow 21c is pumped through the retarder 9 and passed through the heat exchanger 12 via the connecting channel 25b. Crucial for the invention is also the measuring device 20 whose position in the area of the connecting channel 25 b is shown in more detail in FIG. 2. This is provided for measuring the temperature of the oil volume flow 21 b. One sensor of the measuring device 20 is arranged on the connecting channel 25 b. The temperature of the oil volume flow 21 b in the second heat exchanger 12 can thus be measured for all operating states.
Da in allen Betriebszuständen ein Ölvolumenstrom über den Verbindungskanal 25 b geleitet wird, kann für alle Betriebszustände die Temperatur des Ölvolumenstroms 21 b gemessen werden. Somit können in jedem Betriebszustand kritische Temperatur- grenzen überwacht werden. Die Funktion des Getriebes ist damit sichergestellt bzw. das Öl wird vor Überhitzung geschützt. Since an oil volume flow is conducted via the connecting channel 25 b in all operating states, the temperature of the oil volume flow 21 b can be measured for all operating states. Critical temperature limits can thus be monitored in every operating state. The function of the gearbox is thus ensured and the oil is protected against overheating.
Im Falle einer potentiellen Ölüberhitzung greifen Abregelstrategien, mit denen die Öltemperatur auf festlegbare Grenztemperaturen geregelt wird. Zum Beispiel die Re- duzierung der Bremsleistung des Retarders. In the event of a potential oil overheating, control strategies apply, with which the oil temperature is regulated to definable limit temperatures. For example, reducing the braking power of the retarder.
Auf die weiteren dargestellten Leitungen und Elemente des Ölkreislaufs wird im Zu- sammenhang mit dieser Erfindung nicht näher eingegangen, da diese zur Erläuterung der Erfindung nicht relevant sind. Zur Gesamtfunktionalität des Getriebes sind diese allerdings notwendig. Bezugszeichenliste The other lines and elements of the oil circuit shown are not dealt with in more detail in connection with this invention, since these are not relevant for explaining the invention. However, these are necessary for the overall functionality of the transmission. Reference list
1 Ölkreislauf 1 oil circuit
2 Wandler  2 converters
3 Ölzuführleitung 3 oil supply line
4 Bypassleitung  4 bypass line
5 Ventil - Wandlerregelung 5 valve converter control
6 Leitung 6 line
7 WT-Zuführleitung 7 WT supply line
8 Leckstromleitung 8 leakage current line
9 Retarder  9 retarders
10 Zuführleitung  10 supply line
1 1 Wärmetauscher 1 1 heat exchanger
12 Wärmetauscher 12 heat exchangers
13 Umschalt-Ventil 13 changeover valve
14 Umschalt-Ventil  14 changeover valve
15 Rückführleitung  15 return line
16 Kernringbefüllleitung  16 core ring filling line
17 Spaltbefüllleitung 17 Gap filling line
1 8 Rückführleitung 1 8 return line
19 Ölsumpf  19 oil sump
20 Messvorrichtung mit Sensor 20 measuring device with sensor
21 a, b, c, d Ölvolumenstrom 21 a, b, c, d oil flow
22 Wärmetauscherkonsole 23 Wärmetauscher 22 heat exchanger console 23 heat exchanger
24a, b Halter  24a, b holder
25 Verbindungskanäle 25 connection channels
26,27 Ventile  26.27 valves

Claims

Patentansprüche Claims
1. Ölversorgung eines Automatikgetriebes oder automatisierten Schaltge- triebes in einem Antriebsstrang, umfassend einen Ölsumpf (19) und ei- nen Wärmetauscher (11 , 12), wobei die Ölversorgung für zumindest folgende Betriebszustände des Automatikgetriebes vorgesehen ist; dem Wandlerbetrieb 1. Oil supply to an automatic transmission or automated manual transmission in a drive train, comprising an oil sump (19) and a heat exchanger (11, 12), the oil supply being provided for at least the following operating states of the automatic transmission; the converter operation
dem Fährbetrieb in einem der mechanischen Gänge  the ferry operation in one of the mechanical gears
dem Retarderbetrieb  the retarder operation
dadurch gekennzeichnet,  characterized,
dass zwei Wärmetauscher (11 , 12) vorgesehen sind, durch die je nach Betriebszustand des Automatikgetriebes ein Ölvolumenstrom (21 a, b, c) leitbar ist.  that two heat exchangers (11, 12) are provided, through which an oil volume flow (21 a, b, c) can be conducted depending on the operating state of the automatic transmission.
2. Ölversorgung nach Anspruch 1 2. Oil supply according to claim 1
dadurch gekennzeichnet,  characterized,
dass eine Messvorrichtung (20) zur Messung einer Ölkreislauftempe- ratur vorgesehen ist, mittels der in allen Betriebszuständen die Termpe- ratur des Ölvolumenstroms (21 a, b, c) messbar ist.  that a measuring device (20) is provided for measuring an oil circuit temperature, by means of which the temperature of the oil volume flow (21 a, b, c) can be measured in all operating states.
3. Ölkühlkreislauf nach Anspruch 1 3. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass die Messvorrichtung (20) ein Sensor umfasst, mittels dem die that the measuring device (20) comprises a sensor by means of which the
Temperatur des Ölvolumenstroms (21 a, b), der in den ersten und/oder zweiten Wärmetauscher (11 , 12) strömt, messbar ist. Temperature of the oil volume flow (21 a, b), which flows into the first and / or second heat exchanger (11, 12), is measurable.
4. Ölkühlkreislauf nach Anspruch 1 4. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass die Wärmetauscher (11 , 12) für unterschiedliche Ölvolumenströ- me (21 a, b) ausgelegt sind. that the heat exchangers (11, 12) are designed for different oil volume flows (21 a, b).
5. Ölkühlkreislauf nach Anspruch 1 5. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass die Ölvolumenströme (21 a, b) durch den ersten Wärmetauscher (11 ) und den zweiten Wärmetauscher in einem Verhältnis von 1 :2 aus- gelegt sind.  that the oil volume flows (21 a, b) through the first heat exchanger (11) and the second heat exchanger are designed in a ratio of 1: 2.
6. Ölkühlkreislauf nach Anspruch 1 6. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass Ventile (5, 13, 14) vorgesehen sind, mittels denen die Ölvolu- menströme (21 a, b) regelbar sind.  that valves (5, 13, 14) are provided, by means of which the oil volume flows (21 a, b) can be regulated.
7. Ölkühlkreislauf nach Anspruch 1 7. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass ein Druckregelventil (5) zur Regelung des Ölvolumenstroms (21 d) durch den Wandler (2) vorgesehen ist, wobei das Druckregelven- til (5) zwischen Wandler (2) und dem ersten und zweiten Wärmetau- scher (11 , 12) vorgesehen ist.  that a pressure control valve (5) for regulating the oil volume flow (21 d) through the converter (2) is provided, the pressure control valve (5) being provided between the converter (2) and the first and second heat exchangers (11, 12) is.
8. Ölkühlkreislauf nach Anspruch 1 8. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass ein erstes Umschaltventil (13) und ein zweites Umschaltventil (14) vorgesehen sind, so dass im Bremsbetrieb des Retarders ein Öl- volumenstrom (21 c) zur Bremsenergieabfuhr durch den zweiten Wär- metauscher (12) leitbar ist.  that a first changeover valve (13) and a second changeover valve (14) are provided, so that in the braking operation of the retarder an oil volume flow (21c) can be conducted through the second heat exchanger (12) to dissipate braking energy.
9. Ölkühlkreislauf nach Anspruch 1 9. Oil cooling circuit according to claim 1
dadurch gekennzeichnet,  characterized,
dass das erste Schaltventil (13) derart schaltbar ist, das im Fahrbe- trieb, in einem der mechanischen Gänge des Automatikgetriebes, der Ölvolumenstrom (21 d) aus dem Ölsumpf (19) über eine Bypassleitung that the first switching valve (13) is switchable in such a way that the oil volume flow (21 d) from the oil sump (19) via a bypass line in one of the mechanical gears of the automatic transmission
(4) durch den zweiten Wärmetauscher (12) und/oder den ersten Wär- metauscher (11 ) leitbar ist. (4) through the second heat exchanger (12) and / or the first heat exchanger (11).
EP19769397.1A 2018-09-13 2019-09-05 Oil cooling circuit of an automatic transmission Pending EP3850248A1 (en)

Applications Claiming Priority (2)

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DE102018122333.1A DE102018122333A1 (en) 2018-09-13 2018-09-13 Oil cooling circuit of an automatic transmission
PCT/EP2019/073673 WO2020053058A1 (en) 2018-09-13 2019-09-05 Oil cooling circuit of an automatic transmission

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EP (1) EP3850248A1 (en)
CN (1) CN112689722A (en)
DE (1) DE102018122333A1 (en)
WO (1) WO2020053058A1 (en)

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DE102018122333A1 (en) 2020-03-19
CN112689722A (en) 2021-04-20

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